At one-loop order, we find \(\gamma _{m_{\chi }^{2}}=-12\lambda -2N_{f}g^{2}\) , evaluating at the criticality provides \(\nu ^{-1}=2-0.8347\epsilon \)  for \(N_{f}=1\) , and \(\nu ^{-1}=2-0.9524\epsilon \)  for \(N_{f}=2\) . These results
have also been calculated up to three- and four- loop in previous
literatures[1]}, [2]}. At the QCP, it is found empirically that the pair correlation
function of the order-parameter takes the form
\(\langle O_{\text{CDW}}(r)O_{\text{CDW}}(r^{\prime })\rangle \sim \frac{1}{|r-r^{\prime }|^{D-2+\eta _{\chi }}},\) 
